Effect of Schottky barrier alteration on the low-frequency noise of InP-based HEMT's

For the first time the effect of increasing the Schottky barrier's Al content of InP-based InAlAs-InGaAs HEMT's from 48 to 60% on the low-frequency (LP) drain and gate current noise is investigated. It is shown that the LF gate current noise S-IG (f) for the 60% case decreases by almost three decades, while the LF drain current noise S-IDS(f) stays at the same level. From small coherence values, it can be concluded that drain and gate noise sources can be treated separately which facilitates the LF noise modeling of these HEMT's.